class_docstr: Computes mean metric.
class_docstr_tok: ["Computes","mean","metric","."]
code: def create_accumulator(self) -> _Accumulator:
      return _Accumulator()
  
file_path: model-analysis/tensorflow_model_analysis/metrics/stats.py
imports: import dataclasses
  from typing import Any, Dict, Iterable, Optional, Tuple, Union
  import apache_beam
  from tensorflow_model_analysis.metrics import metric_types
  from tensorflow_model_analysis.utils import util
label_desc: Use image node_id 2 for calling the _MeanCombiner obj's underlying member method code with example usage: obj.create_accumulator() and returns: _Accumulator